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The surface species formed from the adsorption of 1,3-butadiene and 1,3-butadiene hydrogenation over the fresh Mo2C/γ-Al2O3 catalyst was studied by in situ IR spectroscopy. It is found that 1,3-butadiene adsorption on the Mo2C/γ-Al2O3 catalyst mainly formsπ-adsorbed butadiene (πs andπd) andσ-bonded surface species. These species are adsorbed mainly on the surface Moδ+(0